Glasgow Coma Scale (GCS)
Severity of GCS
"In fact, the chances of survival with a GCS less than 5 are considered so poor, that in regions with limited resources, patients with a GCS of ≤5 are not even admitted to intensive care units (ICU)". See link.
Summary of my Recorded GCS Values (all 2015)
The values shown above are all taken from the report my neuro-psychiatrist wrote about me by simply searching for the term "GCS", see link.
GCS Background Information
The GCS is the most common scoring system used to describe the level of consciousness in a person following a traumatic brain injury. Basically, it is used to help gauge the severity of an acute brain injury. The test is simple, reliable, and correlates well with outcome following severe brain injury. Generally brain injury is classified as:
See link for more information than that provided in the above snippet.
This link takes you to a web site dedicated to explaining GCS and is seemingly an authority on the subject matter.